Hydrogenated Nitrile Butadiene Rubber
(HNBR), also known as Highly Saturated
Nitrile (HSN), is special class of nitrile
rubber (NBR) that has been
hydrogenated to increase saturation of the butadiene segment of the carbon polymer backbone.
Subsequent improvements to the material properties, over that of
a nitrile rubber (NBR), include greater thermal stability,
broader chemical resistance, and greater tensile strength.

HNBR is classified by ASTM as a DH-type polymer. This classification
indicates 150ºC service temperature as well as less than 30% swell in IRM 903
oil. HNBR can be formulated to meet application temperatures ranging between
-50°C and 165ºC.